exam Maths Puzzle Numerical Ability

the denominator must be changed to a multiplier of 4.
4cube 5x^8y^3 / 4cube 27x^2. Why would it be multiplied by 4cube 3x^2 / 4cube 3x^2? 27 x 3 = 81, not a multiplier of 4. Than

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5x - 3y = 15; (5, 2). Please help A debt of $3,000.00 due in 7 years and $2,000.00 due in 3 years is to be repaid by a single payment of $1,000.00 now and two equal payments which are due 1 year from now and 4 year